Utilize matrix for texting multiple mysql versions (krowinski#119)

Author: DZunke

.github/workflows/tests.yml

@@ -2,22 +2,22 @@ name: PHP Tests
 on: [push, pull_request]
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
+    strategy:
+        matrix:
+            php: [ '8.2' ]
+            mysql-version: [ '5.7', '8.0', '8.4' ]
+
     services:
       mysql:
-        image: mysql:5.7
+        image: "mysql:${{ matrix.mysql-version }}"
         env:
           MYSQL_ROOT_PASSWORD: root
           MYSQL_DATABASE: mysqlreplication_test
         ports:
           - 3306/tcp
 
-    strategy:
-      matrix:
-        php: [ '8.2' ]
-
     steps:
       - name: Checkout
         uses: actions/checkout@v2